It all depends upon your level of risk and how badly you want the data returned to you unharmed. Ransomware is obviously analogous to kidnapping, and dealing with the perpetrators can feel much like negotiating with a jumper standing on the edge of high-rise roof. The Institute for Critical Infrastructure Technology recently released a report that in part describes how to deal with criminals when they are holding your data hostage. The report talks of what to do once a breach has been found.